Approximate - nearest available gauge. Use as general reference only.
After maybe 2-300 hundred yards of boogie you will come to a horizon line where the flow is mainly on the left half of the creek, eddy on the right, big rock on the right edge of the horizon line.
This is a chunky slide/ledge that serves as the entrance to Slide to Boof. If Scirum is cranking, it will feed right into the main slide below. If it's low, you'll be able to stop in the slack below.